CN110889180B - Design method of fan ring torque-shaped isolation section - Google Patents
Design method of fan ring torque-shaped isolation section Download PDFInfo
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- CN110889180B CN110889180B CN201911252712.1A CN201911252712A CN110889180B CN 110889180 B CN110889180 B CN 110889180B CN 201911252712 A CN201911252712 A CN 201911252712A CN 110889180 B CN110889180 B CN 110889180B
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Abstract
The invention discloses a design method of a fan ring torque-shaped isolation section, wherein the inlet section of the isolation section is a fan ring, and the outlet section is rectangular; the geometric similarity principle of the along-the-way normal section is adopted in the process of transition from the fan ring to the rectangle, the fan ring center line arc length Lc, the fan ring thickness h and the gradual transition of the along-the-way normal area S and the fan ring fan angle alpha are controlled through controlling the fan ring center to the rectangle center along-the-way guiding curve AB, so that the stability of the flow field of the isolation section in the back pressure state is ensured.
Description
Technical Field
The invention belongs to the technical field of air suction type aircraft engines, and particularly relates to a design method of a fan ring torque-shaped isolation section.
Background
The dual-mode ramjet engine comprises the following components: precursor/inlet channel, separation section, combustion chamber, tail nozzle/aft body. The isolation section is located between the inlet and the combustion chamber and is typically a section of uniform cross-section or slightly flared circular or rectangular tubing. Although the geometry of the isolated block is relatively simple, the flow phenomenon within it is complex. In the sub-combustion mode of the engine, the isolation section plays a role in stopping supersonic airflow to subsonic speed, meeting the flow conditions required by combustion of the downstream combustion chamber, and the shock wave strings are matched with the high back pressure of the downstream combustion chamber to prevent the change of the back pressure of the downstream combustion chamber from affecting the flow state of the upstream air inlet channel and avoid the non-starting of the air inlet channel. The performance of an isolated segment as an important component of an aircraft directly affects the overall performance of the ramjet engine and the stability of each component, so the isolated segment has important engineering significance in research.
Viewed from another aspect, the ramjet runner is of a duct configuration, occupying a significant portion of the aircraft interior space. To facilitate aircraft interior equipment installation, matching engine combustor and tail nozzle configurations and placement locations is required. The shape and position of the section of the air inlet throat are determined by the form, the geometric dimension and the layout position of the air inlet, and all the air inlet throat and the air inlet throat need to be designed integrally with the aerodynamic shape of the aircraft. The spacer section, as a component connecting the inlet throat and the combustion chamber inlet, is required to be able to smooth the upstream and downstream cross-sections and to have excellent aerodynamic properties. The isolation section is used for realizing the transition of the geometric profile of the air inlet channel and the geometric profile of the combustion chamber and realizing performance matching.
The isolation section is generally rectangular or circular in cross-section, and fewer special-shaped isolation sections are involved in regard to the inlet throat cross-section being fan-shaped and the combustion chamber inlet being rectangular in shape, i.e., the isolation section being fan-shaped and circular.
Disclosure of Invention
In view of the above, the invention provides a design method of a fan ring torque-shaped isolation section, which can realize smooth transition of the geometric profile of the isolation section from a fan ring to a rectangle and has excellent aerodynamic performance.
The technical scheme for realizing the invention is as follows:
a design method of a torque-shaped isolation section of a fan ring comprises the steps that the inlet section of the isolation section is a fan ring, and the outlet section is rectangular; in the process of transition from the fan ring to the rectangle, the geometric similarity principle of the along-path normal section is adopted, and the flow field stability of the isolation section in the back pressure state is ensured by controlling the along-path guiding curve AB from the center of the fan ring to the center of the rectangle, the arc length Lc of the center line of the fan ring, the thickness h of the fan ring, the gradual transition of the along-path normal area S and the fan angle alpha of the fan ring.
Further, the design method specifically comprises the following steps:
step one, describing the isolation section edge Cheng Jiemian by adopting fan ring parameters, wherein the rectangular section of the isolation section outlet is considered as a fan ring with the radius of the inner ring and the outer ring approaching infinity, and the arithmetic average value of the radius of the inner ring and the outer ring of the fan ring is the radius y of the center line of the fan ring 0 The fan angle of the fan ring is alpha, the difference between the outer ring and the inner ring radius of the fan ring is the thickness h of the fan ring, the arc length of the center line of the fan ring is Lc, and the area of the fan ring is S;
step two, determining the distribution of the isolation sections along a path guiding curve AB, wherein the center point of the inlet section of the isolation section is A, and the center point of the outlet section of the isolation section is B; the direction A is the normal direction of the inlet section of the isolation section, and the direction B is the normal direction of the outlet section of the isolation section; the guide curve AB is determined by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point direction, the rear three points control the end point direction, and the middle point controls the shape of the guide curve;
step three, determining the expansion ratio ER of the area of the isolation section along the fan ring by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point area change trend, the rear three points control the end point area change trend, and the middle points control the distribution shape of the area along the path;
step four, determining the arc length Lc of the isolation section along the Cheng Shanhuan central line by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the change trend of the initial arc length, the rear three points control the change trend of the final arc length, and the middle points control the arc length along-path distribution shape;
fifthly, the maximum value of the edge fan ring fan angle alpha of the isolation section is the fan ring fan angle of the inlet section of the isolation section, the edge fan angle is gradually changed from alpha to 0 DEG, the fan angle alpha is determined by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point fan angle change trend, the rear three points control the end point fan angle change trend, and the middle points control the fan angle edge distribution shape;
step six, determining the circle center of an inlet fan ring of the isolation section as a coordinate origin, the normal direction of the inlet fan ring as an x-axis, the symmetry line of the fan ring as a y-axis, and determining a z-axis according to a right-hand rule; the along-path guiding curve AB, the along-path area expansion ratio ER, the center line arc length Lc and the fan angle alpha determined according to the steps; fan ringCenter line arc length formula lc=α×y 0 And the sector area formula s=lc×h to obtain the coordinates of the isolated segment along the path.
The beneficial effects are that:
1. the invention simplifies the torque-shaped isolating section edges Cheng Jiemian of the fan ring into the fan ring, and constructs a parameterization method for realizing the profile of the isolating section, which is convenient for connecting the air inlet channel and the combustion chamber from the geometric constraint.
2. The invention has the advantages that the along-path cross-sectional area of the isolation section is controllable, the back pressure resistance of the isolation section can be improved to the greatest extent, and the performance matching of the air inlet channel and the combustion chamber is simplified.
Drawings
FIG. 1 is a section of an inlet fan ring of an isolated block. Wherein, 1-sector ring section; 2-an outer arc of the fan ring; 3-circular arc in fan ring; 4-fan ring sides; 5-fan ring centerline arc length Lc.
Fig. 2 is a section of the spacer along Cheng Shanhuan. Wherein, 6-along Cheng Faxiang fan ring section.
Fig. 3 is a rectangular cross section of the spacer section outlet. Wherein 7-rectangular cross section.
Fig. 4 is an isolated segment along-the-path guide curve (AB). Wherein, the point A is the center point of the inlet section of the isolation section; point B is the center point of the outlet section of the isolation section.
FIG. 5 is a plot of the spacer section along the cross-sectional area Expansion Ratio (ER) profile.
Fig. 6 is a graph of the insulation segments distributed along the Cheng Jiemian centerline arc length (Lc).
Fig. 7 is a graph of the angular sector (α) distribution of the isolated segments along the Cheng Shanhuan cross-section.
Fig. 8 is a three-dimensional profile of the spacer section. Curve AB is the isolated segment along-path guide line.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
The invention provides a design method of a fan ring torque-shaped isolation section, which comprises the following implementation steps:
step one, defining the parameters of the section of the isolation section along Cheng Faxiang. The isolation segment edges Cheng Jiemian are all described by fan ring parameters. As shown in FIG. 3, the rectangular cross section of the separator outlet can be considered as inner and outerThe ring radius tends to be infinite for a fan ring. As shown in fig. 1 and 2, the arithmetic average of the inner ring and outer ring radii of the sector ring is the center line radius y of the sector ring 0 . The fan angle of the fan ring is alpha. The difference between the outer ring and the inner ring radius of the fan ring is the thickness h of the fan ring. The arc length of the center line of the fan ring is Lc. The area of the fan ring is S.
And step two, determining the distribution of the isolation sections along the path guiding curve AB. The center point of the inlet section of the isolation section is A, and the center point of the outlet section of the isolation section is B. The direction of a starting point A of the curve AB is the normal direction of the inlet section of the isolation section, and the direction of a finishing point B is the normal direction of the outlet section of the isolation section. The director curve AB was determined using a 6 th order bezier spline. Wherein the front three points of the beizer spline curve control the starting point direction, and the rear three points control the end point direction. The middle point controls the shape of the guide curve. Fig. 4 is an isolated segment along-the-path guide curve (AB).
And thirdly, determining the expansion ratio ER of the isolation section along the fan ring area. The area expansion ratio ER is determined by adopting a 6-order bezier spline curve. Wherein the front three points of the beizer spline curve control the starting point area change trend, and the rear three points control the end point area change trend. The intermediate points control the area along the path profile. FIG. 5 is a plot of the spacer section along the cross-sectional area Expansion Ratio (ER) profile.
And step four, determining the arc length Lc of the isolation section along the central line of Cheng Shanhuan. The centerline arc length Lc is determined using a 6 th order bezier spline curve. Wherein, the front three points of the beizer spline curve control the change trend of the starting point arc length, and the rear three points control the change trend of the ending point arc length. The intermediate point controls the arc length along the path distribution shape. As shown in fig. 6, the isolated segments are distributed along the Cheng Jiemian centerline arc length (Lc).
Step five, determining the edge fan ring fan angle alpha of the isolation section. The maximum value of the fan angle alpha is the fan angle of the fan ring of the inlet section of the isolation section. The fan angle is gradually changed from alpha to 0 deg. The fan angle alpha is determined by adopting a 6-order bezier spline curve. Wherein, the front three points of the beizer spline curve control the change trend of the starting point fan angle, and the rear three points control the change trend of the ending point fan angle. The middle point controls the fan angle along-the-way distribution shape. The isolated segments are distributed along the Cheng Shanhuan cross-sectional fan angle (α) as shown in fig. 7.
And step six, constructing the three-dimensional molded surface of the isolation section. Determining the circle center of the inlet fan ring of the isolation section as the origin of coordinates, and enteringThe normal direction of the fanning ring is an x-axis, and the symmetrical line of the fanning ring is a y-axis. The z-axis is determined according to the right hand rule. The along-path guide curve AB, the along-path area expansion ratio ER, the center line arc length Lc, and the fan angle α are given according to the above steps, respectively. According to the fan ring center line arc length formula lc=α×y 0 And the sector area formula s=lc×h to obtain the coordinates of the isolated segment along the path.
The following describes a specific application of the isolation segment approach of the present invention in a ramjet design with a specific embodiment.
Fig. 8 is a schematic illustration of an isolated block configuration scheme implemented by the present invention.
Wherein, the control parameters of the inlet fan ring section of the isolation section are as follows: α=62°, h=32, lc=865
The control parameters of the rectangular section of the outlet are as follows: α=0°, h=104, lc=280.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (1)
1. A design method of a fan ring torque-shaped isolation section is characterized in that the inlet section of the isolation section is a fan ring, and the outlet section is rectangular; the geometric similarity principle of the along-the-way normal section is adopted in the process of transition from the fan ring to the rectangle, and the flow field stability of the isolation section in the back pressure state is ensured by controlling the along-the-way guiding curve AB from the center of the fan ring to the center of the rectangle, the arc length Lc of the center line of the fan ring, the thickness h of the fan ring, the gradual transition of the along-the-way normal area S and the fan angle alpha of the fan ring;
the design method specifically comprises the following steps:
step one, describing the isolation section edge Cheng Jiemian by adopting fan ring parameters, wherein the rectangular section of the isolation section outlet is considered as a fan ring with the radius of the inner ring and the outer ring approaching infinity, and the arithmetic average value of the radius of the inner ring and the outer ring of the fan ring is the radius y of the center line of the fan ring 0 The fan angle of the fan ring is alpha, the difference between the outer ring and the inner ring radius of the fan ring is the thickness h of the fan ring, the arc length of the center line of the fan ring is Lc, and the area of the fan ring is S;
step two, determining the distribution of the isolation sections along a path guiding curve AB, wherein the center point of the inlet section of the isolation section is A, and the center point of the outlet section of the isolation section is B; the direction A is the normal direction of the inlet section of the isolation section, and the direction B is the normal direction of the outlet section of the isolation section; the guide curve AB is determined by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point direction, the rear three points control the end point direction, and the middle point controls the shape of the guide curve;
step three, determining the expansion ratio ER of the area of the isolation section along the fan ring by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point area change trend, the rear three points control the end point area change trend, and the middle points control the distribution shape of the area along the path;
step four, determining the arc length Lc of the isolation section along the Cheng Shanhuan central line by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the change trend of the initial arc length, the rear three points control the change trend of the final arc length, and the middle points control the arc length along-path distribution shape;
fifthly, the maximum value of the edge fan ring fan angle alpha of the isolation section is the fan ring fan angle of the inlet section of the isolation section, the edge fan angle is gradually changed from alpha to 0 DEG, the fan angle alpha is determined by adopting a 6-order bezier spline curve, wherein the front three points of the bezier spline curve control the starting point fan angle change trend, the rear three points control the end point fan angle change trend, and the middle points control the fan angle edge distribution shape;
step six, determining the circle center of an inlet fan ring of the isolation section as a coordinate origin, the normal direction of the inlet fan ring as an x-axis, the symmetry line of the fan ring as a y-axis, and determining a z-axis according to a right-hand rule; the along-path guiding curve AB, the along-path area expansion ratio ER, the center line arc length Lc and the fan angle alpha determined according to the steps; fan ring center line arc length formula lc=α×y 0 And the sector area formula s=lc×h to obtain the coordinates of the isolated segment along the path.
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| CN108999845A (en) * | 2018-09-06 | 2018-12-14 | 中国人民解放军国防科技大学 | Three-dimensional variable cross-section curved flow channel design method and device based on geometric fusion |
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